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⌂ ∞ Elite on the BBC Micro and NES

Version analysis of FONT%

This code appears in the following versions (click to see it in the source code):

Code variations between these versions are shown below.

       Name: FONT%
       Type: Variable
   Category: Text
    Summary: A copy of the character definition bitmap table from the MOS ROM



 This is used by the TT26 routine to save time looking up the character bitmaps
 from the ROM. Note that FONT% contains just the high byte (i.e. the page
 number) of the address of this table, rather than the full address.

 The contents of the P.FONT.bin file included here are taken straight from the
 following three pages in the BBC Micro OS 1.20 ROM:

   ASCII 32-63  are defined in &C000-&C0FF (page 0)
   ASCII 64-95  are defined in &C100-&C1FF (page 1)
   ASCII 96-126 are defined in &C200-&C2F0 (page 2)

 The code could look these values up each time (as the cassette version does),
 but it's quicker to use a lookup table, at the expense of three pages of
 memory.

Code variation 1 of 3A variation in the comments only

This variation is blank in the Master version.

6502SP
 The Executive version uses a different font to the standard OS, which is
 included in the P.FONTEX.bin file. This means all in-game text uses this new
 font, which is based on the 1960s Westminster font. The font style is similar
 to the machine-readable font on cheques, and is in a style that we would now
 call "retro-futuristic" (though presumably it was just "futuristic" back in
 1984).

Code variation 2 of 3Specific to an individual platform

This variation is blank in the Master version.

6502SP
 ORG CODE%

 FONT% = P% DIV 256

Code variation 3 of 3Related to the 6502SP version

The Executive version uses a unique font, which is based on the 1960s Westminster font (it's similar to the machine-readable font on cheques - "retro-futuristic" is probably what we'd call it these days).

Tap on a block to expand it, and tap it again to revert.

Master
6502SP
 INCBIN "versions/master/1-source-files/fonts/P.FONT.bin"

IF _SNG45 OR _SOURCE_DISC
 INCBIN "versions/6502sp/1-source-files/fonts/P.FONT.bin"
ELIF _EXECUTIVE
 INCBIN "versions/6502sp/1-source-files/fonts/P.FONTEX.bin"
ENDIF